fourth ventricle n. An irregular cavity that extends from the obex to a communication with the sylvian aqueduct and is enclosed between the cerebellum dorsally and the tegmentum of rhombencephalon ventrally.

noun 1. the world’s most poverty-stricken nations, especially in Africa and Asia, marked by very low GNP per capita and great dependence upon foreign economic aid. noun 1. the poorest countries in the most undeveloped parts of the world in Africa, Asia, and Latin America 2. the poorest people in developed countries

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